Fullbring: According to Kugo, Fullbring works by a human or other non-magical, generally normal being injecting spiritual energy of above-average potency, amount, or just of unique qualities into an object to create a special change in the object so that it is usable in battle. An example would be Kugo's own use of his sword-pendant to generate a massive claymore.

However, the object used must have some importance to the owner - And objects which are closer to the heart, like a gift from a beloved person, a trusty weapon, or a "lucky" piece of armor are much more receptive and easier to train into a stronger form. Kugo has stated that the two types are Object and Clad - Object-Types are a separate structure through which an effect is channeled, while Clad-Types coat part or all of the user's body, and are a bit more rare.

Soul Manipulation: According to Kugo Ginjo, Fullbringers are able to manipulate their own souls and the "souls" of objects in their surroundings; supposedly with various uses in combat situations. Kugo demonstrated this by pulling on a drink's "soul" and guiding it into his mouth.